First of all, we must understand what we are looking for. We know that producers are basically organisms which make their own food. Therefor some examples are:
1) Algae (creates its own food using energy from the sun)
2) Plants (creates its own food using energy from the sun)
3) Phytoplankton
I hope this helps!
 
        
             
        
        
        
Answer choice D, as it shows that the experiment is repeated.
        
                    
             
        
        
        
Autotrophic behaviour depends on the ability of the cell to carry out photosynthetic or aerobic respiratory metabolism, which are the only processes able to deliver sufficient energy to maintain carbon fixation. The Calvin cycle is used by bacteria to synthesize organic compounds.
        
             
        
        
        
Aristotle classification
He classified plant and animals into two separate kingdoms
Modern Classification
In this system also, there were two separate kingdoms for plant and animals
 
        
                    
             
        
        
        
Multi cellular organisms like animals are eukaryotes